greenacc
Searching for the billion
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My thoughts, probably nothing. Most full Synthetic 5W40 oils are good quality oils that will keep your engine very clean.What is different about Royal Purple for sludge ?
Edge, Synpower, HPR, Caltex Havoline, shell ultra, and probably Nulon will all do a fine job. It's the cheap semi Synthetics that too many people and workshops use, and leave in there for way too long that kills them.